Yuping Zeng, Jinru Chen, Feng Wang and Yanxia Meng. (2014). A Priori and a Posteriori Error Estimates of a Weakly Over-Penalized Interior Penalty Method for Non-Self-Adjoint and Indefinite Problems. Journal of Computational Mathematics. 32 (3). 332-347. doi:10.4208/jcm.1403-CR5